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    <title>Sentinel Toolbox Help - Product Subset</title>
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        <td class="header">&nbsp;
            Product Subset</td>
        
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<h3>Product Subset Definition</h3>


<p align="center"><img src="images/SubsetDialog.png"><br>
</p>

<p>The dialog is divided into four tabs, each providing specific subset options.<br>

<h4>Spatial Subset</h4>


<p>If you are not interested in the whole image, you may specify an area
    of the product to be loaded. You can select the area by dragging the blue
    surrounding rectangle in the preview (see figure above). You can also specify
    the area manually either by pixel coordinates or by geo coordinates. If you drag
    the rectangle, the field values change simultaneously.<br>
</p>
<p>You can also specify a sub-sampling, by setting the values of
    <code>Scene step X</code> and <code>Scene step Y</code>.
</p>

<p>When the input is a multisize product a combo for selecting the reference band
    is available. The pixel coordinates used are the pixel coordinates in this reference band.<br>
</p>
<p align="center"><img src="images/SubsetDialogMultisize.png"><br>
</p>

<p class="inote">
    <b>NOTE:</b> Pins outside of the spatial subset area will not be preserved in the
    resulting product, because they are bound to the pixel coordinates of the product. <br/>
    GCPs are preserved, because they are bound to a geo-location.
</p>

<h4>Band Subset</h4>

<p>This tab is used to select the bands you want to have in your product subset.</p>

<h4>Tie-Point Grid Subset</h4>

<p>As with bands, this tab is used to select the tie-point grids you want to have in your product subset.
    The tie-point grids named <code>latitude</code> and <code>longitude</code> can not be deselected
    because they provide essential geo-coding information.</p>

<h4>Metadata Subset</h4>

<p>The tab lets you select/deselect meta-data records and tables. By default all meta-data tables are deselected,
    because they can be very huge for <a href="../general/envisat-products/index.html">ENVISAT products</a> and may reduce
    the performance of the Sentinel Toolbox.</p>

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